The only reason Google is doing this is they're about to get hammered for having a nearly all-male workforce. Truly, Google could care less whether this program actually accomplishes anything or whether more women get into coding. If it works, great. If it doesn't work, well, they can always say they've poured a few million dollars into the effort and they tried.
Frankly, I could care less whether the program works or not, or even the fact that it is aimed squarely at women. This is because a lot of coders out there today have no clue how computers work, and barely understand what they're doing. The whole idea that all we need to do is encourage people to code and we'll magically get more coders is ludicrous. Steinway could start a program to get more kids interested in playing the piano, and the result would be a million kids who could play "Twinkle, Twinkle Little Star", and little else, and perhaps a handful of Harry Connick Jrs. Like surgery, or music, or higher math, or prose, it takes a certain amount of talent to be really good at programming, and there are only so many people who have that talent.
For a few million dollars Google has bought themselves a lot of good will, and probably staved off a lawsuit or two, without changing much of anything.